Mariners RHP Bryan Woo has ‘positive’ throwing session

Oct 2, 2025, 3:53 PM

Seattle Sports

Seattle Mariners starting pitcher Bryan Woo threw a bullpen session off the T-Mobile Park mound on Thursday afternoon, which marked an important step as the All-Star right-hander attempts to work back from inflammation in his right pectoral muscle.

Woo’s throwing session included simulated at-bats against live, non-swinging batters, according to MLB.com’s Daniel Kramer.

The ALDS is set: Mariners will face Tigers

It remains unclear how Woo will factor into the Mariners’ plans for the American League Division Series against the Detroit Tigers, which begins on Saturday.

“A positive day,” Woo said after his throwing session. “Still not where I want to be in terms of game speed of everything. But in terms of how everything’s progressed, I’m happy with it, considering a week ago I wasn’t even throwing yet. And then a week from now hopefully we’ll be in a better spot.”

Woo with Harry Ford standing in. Clearly no swing BP pic.twitter.com/ZQpBrblmyk

— Shannon Drayer (@shannondrayer) October 2, 2025

The 25-year-old Woo exited his Sept. 19 start in Houston due to pectoral tightness after throwing five scoreless innings on 67 pitches. He skipped his final start of the season last week, but the Mariners decided against putting him on the 15-day injured list, with the hope that he’d be back to pitch at some point during the ALDS.

“I just know I’m getting closer,” Woo said. “(Today) was a big step. Still not quite at game speed with everything. But in terms of how everything has progressed and how I’ve felt each day, I’m happy with it.”

#Mariners Pitcher Bryan Woo speaks to the media after throwing a bullpen & to hitters today at T-Mobile Park. pic.twitter.com/v8z8oUzpDP

— Seattle Sports (@SeattleSports) October 2, 2025

Woo said right now the focus is building back his velocity and volume in a smart way.

“You want to be smart about it,” Woo said. “It doesn’t do any good to just recklessly throw as hard as I can and just to do it just to see a number. It’s gotta be done the right way. So just kind of putting my trust in the coaching staff and training staff and listening to what they say. And they were happy with today, so I’m happy.”

Woo was the Mariners’ best pitcher this season. He finished fifth in the American League in ERA (2.94), third in WHIP (0.93), tied for third in opponents’ batting average (.200), fifth in strikeouts (198) and seventh in innings pitched (186 2/3).

The Mariners will host the Tigers for Games 1 and 2 of the ALDS on Saturday and Sunday. The best-of-five series then heads to Detroit for Game 3 next Tuesday and Game 4 next Wednesday, if necessary. If the series goes the full length, Game 5 would be back in Seattle on Friday, Oct. 10.

“I’m just trying to take it day by day,” Woo said.